Englishdarken
verb
1 the sky darkened:
grow dark/darker, blacken, grow black/blacker, dim, grow dim, cloud over, lour.
▷antonyms lighten.
2 fixative can darken the colours in a picture:
make dark/darker, blacken, make black/blacker, make dim, shade, eclipse, fog, obscure.
3 the misery that darkened his later life | his mood darkened:
make/become gloomy, make/become angry, make/become unhappy, make/become annoyed, make/become depressed, cast down, become cast down, deject, become dejected, weigh down, oppress, dampen the spirits of, make/become dispirited, make/become troubled, cast a pall over, blacken, look black, sadden;
spoil, mar, detract from.
darken Oxford Dictionary of English